L1₀型FePd規則合金ナノ粒子の長範囲規則度

SATO, Kazuhisa; HIROTSU, Yoshihiko

doi:https://doi.org/10.5940/jcrsj.50.262

L1₀型FePd規則合金ナノ粒子の長範囲規則度

SATO, Kazuhisa; HIROTSU, Yoshihiko

日本結晶学会誌, 2008, 50(4), 262-268

Number of Access:249（2025-09-30 08:02 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97372

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Title	L1₀型FePd規則合金ナノ粒子の長範囲規則度
	Long-Range Order Parameter of L1₀-Type FePd Ordered Alloy Nanoparticles
	L1₀ガタ　FePd　キソク　ゴウキン　ナノ　リュウシ　ノ　チョウハンイ　キソクド
Creator	NRID 1000070314424 1000070314424 ORCID 0000-0001-9078-2541 0000-0001-9078-2541 researchmap permalink read0158304 read0158304 Scopus Author ID 55552977400 55552977400 CreatorName SATO, Kazuhisa
Creator	NRID 1000070016525 1000070016525 researchmap permalink read0185227 read0185227 CreatorName HIROTSU, Yoshihiko
Abstract	Hard magnetic properties of FePd nanoparticles originate from their L1₀-type tetragonal ordered structure with high magnetocrystalline anisotropy energy. In order to know correlations among the long-range order (LRO) parameter (S), the particle size and the anisotropy energy, we employed a new technique to determine LRO parameter of single L1₀-FePd nanoparticle using nanobeam electron diffraction (NBD) . The LRO parameter was determined by quantitative analysis of NBD intensities recorded on imaging plates together with intensity calculations considering the multiple scattering of electrons. In taking NBD patterns, hh0 systematic reflections were excited using a transmission electron microscope with a field emission gun operated at 300 kV. Specimen thickness was evaluated by electron holography. The obtained order parameters of individual nanoparticles larger than 8 nm are almost around the mean LRO parameter (S=0.79) determined by selected area electron diffraction. In contrast, the parameters gradually decrease as the particle size decreases below 8 nm (S=0.60-0.73) . The low degree of order in very small particles is responsible for the coercivity (anisotropy energy) decrease of the L10 nanoparticles in smaller sized region. Experimental conditions required for NBD analysis are presented in detail and the possible experimental errors of the determined LRO parameters are discussed.
Publisher	日本結晶学会
Publisher	The Crystallographic Society of Japan
Source Title	日本結晶学会誌
Source Title	Journal of the Crystallographic Society of Japan
Volume (Issue)	50(4)
Page	262-268
Date of Issued	2008-08-29
Language	Japanese
Handle URL	https://hdl.handle.net/11094/97372
PISSN	03694585
eISSN	18845576
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.5940/jcrsj.50.262
Access Rights	open access
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCTERMS.bibliographicCitation	日本結晶学会誌. 2008, 50(4), p. 262-268
DC.title	L1₀型FePd規則合金ナノ粒子の長範囲規則度
	Long-Range Order Parameter of L1₀-Type FePd Ordered Alloy Nanoparticles
	L1₀ガタ　FePd　キソク　ゴウキン　ナノ　リュウシ　ノ　チョウハンイ　キソクド
DC.creator	SATO, Kazuhisa
DC.creator	HIROTSU, Yoshihiko
DC.publisher	日本結晶学会
DC.publisher	The Crystallographic Society of Japan
DC.language' scheme='DCTERMS.RFC1766	Japanese
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2008-08-29
DC.identifier	https://doi.org/10.5940/jcrsj.50.262
DCTERMS.abstract	Hard magnetic properties of FePd nanoparticles originate from their L1₀-type tetragonal ordered structure with high magnetocrystalline anisotropy energy. In order to know correlations among the long-range order (LRO) parameter (S), the particle size and the anisotropy energy, we employed a new technique to determine LRO parameter of single L1₀-FePd nanoparticle using nanobeam electron diffraction (NBD) . The LRO parameter was determined by quantitative analysis of NBD intensities recorded on imaging plates together with intensity calculations considering the multiple scattering of electrons. In taking NBD patterns, hh0 systematic reflections were excited using a transmission electron microscope with a field emission gun operated at 300 kV. Specimen thickness was evaluated by electron holography. The obtained order parameters of individual nanoparticles larger than 8 nm are almost around the mean LRO parameter (S=0.79) determined by selected area electron diffraction. In contrast, the parameters gradually decrease as the particle size decreases below 8 nm (S=0.60-0.73) . The low degree of order in very small particles is responsible for the coercivity (anisotropy energy) decrease of the L10 nanoparticles in smaller sized region. Experimental conditions required for NBD analysis are presented in detail and the possible experimental errors of the determined LRO parameters are discussed.
DC.format	97372
citation_title	L1₀型FePd規則合金ナノ粒子の長範囲規則度
citation_author	SATO, Kazuhisa
citation_author	HIROTSU, Yoshihiko
citation_publisher	日本結晶学会
citation_language	Japanese
citation_date	2008-08-29
citation_journal_title	日本結晶学会誌
citation_volume	50
citation_issue	4
citation_firstpage	262
citation_lastpage	268
citation_doi	https://doi.org/10.5940/jcrsj.50.262
citation_public_url	https://hdl.handle.net/11094/97372

L1₀型FePd規則合金ナノ粒子の長範囲規則度

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